Kenwood TK-3401D Service Manual page 26

LEVEL DIAGRAM
Receiver Section
RF (Center Frequency)
5
N : –121.5dBm
ANT BPF LNA
G1
Q405
To make measurements in the RF section, connect the RF level meter.
N : –120.5dBm
In the RF section, use a 0.01µF coupling capacitor.
4
(The display shows the SSG input value required to obtain 12dB SINAD.)
TP
Transmitter Section
AF (1KHz)
3
13.65mVrms 62.9mVrms
MIC
Baseband
20
IC
CML
21 24
C775
IC705
2
To make measurements in the AF section, connect the AC level meter.
AG is set so that MIC input becomes 1.5kHz (Narrow) DEV at 1kHz MOD.
1
A B
IF1 (49.95MHz)
N : –117.0dBm
–106.0dBm N : –110.0dBm N : –106.5dBm
BPF MCF
D G2 D
Mixer XF400
Q404
TX VCO
88.38mVrms
–4.45dBm
Q9 Q10
C74
C
(No.RA012<Rev.001>) 2-4
IF2 (450kHz)
N : –104.0dBm
IF AMP FM IC
1
Q403 IC400
–2.35dBm
2.2dBm
–13.8dBm
PRE DRIVE
DRIVE FET
AMP
C81 C216 C219
Q201 Q206
To make measurements in the RF section, connect the RF Wattmeter (50ohm).
In the RF section, use a 270pF coupling capacitor.
D E
2-4 (No.RA012<Rev.001>)
AF (1kHz)
96mVrms 73mVrms 14mVrms
72mVrms 355mVrms
Baseband Baseband
IC IC
13 16
17 16 26
CML CML
IC705 IC705
To make measurement in the AF section, connect the AC level meter.
(ANT input: –53dBm, 1kHz FM, 1.5kHz Dev (Narrow).)
The AF output level is adjusted for a 0.6Vrms/8ohm by the Volume knob.
RF (Center Frequency)
6.1dBm 21.4dBm
FINAL FET
C228 C268 D203
Q208
D204
F
0.63Vrms
0.80Vrms
IC707 J601
4
10
0.83W
TP
ANT
G